What was the prescribed initial fluid therapy for Hannah Johnson upon her presentation to the emergency department?

The initial fluid therapy of IV 0.9% normal saline at 150 ml/hour is appropriate for Hannah Johnson's presentation in the emergency department as it provides a balanced approach to rehydration and electrolyte replacement. In many pediatric cases, especially those presenting with dehydration—such as from vomiting or diarrhea—normal saline is often the first choice due to its isotonic nature, which helps maintain extracellular fluid balance.

Normal saline can effectively restore intravascular volume and improve circulation, while aiding in the correction of any electrolyte imbalances that may have occurred. The rate of 150 ml/hour is typically considered adequate to begin with, allowing for adjustments based on the patient’s response and ongoing assessments of hydration status and vital signs.

In examining other choices, D5W (Dextrose 5%) would not be as effective for initial fluid therapy in cases of dehydration, as it does not provide the necessary sodium needed for rehydration and may lead to an exacerbation of the patient's condition when a rapid resuscitation is crucial. An oral rehydration solution could also be appropriate in mild dehydration cases but would not suffice if IV therapy is indicated, particularly in emergency settings where rapid intravenous access is available. IV LR (Lactated Ringer's